According to the elasTc rebound hypothesis, most earthquakes are produced by the rapid release of energy stored in rock that has been subjected to great forces. When the strength of the rock is exceeded, it suddenly breaks, releasing some of its stored energy as seismic waves. AFershocks and Â±oreshocks Even a great earthquake like the 1906 San Francisco earthquake usually does not release all the elasTc energy stored in the rock along a fault.
Type rating. A type rating is a regulating agency's certification of an airplane pilot to fly a certain aircraft type that requires additional training beyond the scope of the initial license and aircraft class training. What aircraft require a type rating is decided by the local aviation authority.
CDL Endorsements and Restrictions: Drivers who operate special types of CMVs also need to pass additional tests to obtain any of the following endorsements on their CDL: T - Double/Triple Trailers Endorsement (Knowledge Test only) P - Passenger Endorsement (Knowledge and Skills Test) N - Tank Vehicle Endorsement (Knowledge Test only)